A heat pump unit under 841861 is a compression-type refrigerating machine with a heat-exchanger condenser that is not configured as a complete air conditioning machine with a motor-driven fan and humidity-control elements. When those additional elements are present and integrated, the assembly moves to the air conditioning heading. The presence or absence of a motor-driven fan combined with humidity control is the functional dividing line.

Furniture specifically designed to receive refrigerating or freezing equipment is classified under 841891 within this heading, not under the furniture chapters. This applies to cabinetry or enclosures purpose-built to house refrigerating units, where the refrigerating function defines the article's character.